Justice Served on 48 Hours, Mystery

After fighting each year for a spot on the prime-time schedule, the long-running newsmagazine is looking more secure since it's been turned into what could be called CSI: CBS News.

The show still has its single-topic format, but gone are the long-winded intros by a CBS anchor, so viewers now get right into the story.

The changes have resulted in decent ratings and a different kind of show for CBS News. While 60 Minutes wouldn't touch the Laci Peterson murder case — which has offered up endless fodder for lurid supermarket tabloid covers — 48 Hours Mystery dove right in.

But the show is at its best when it takes a Law &amp; Order-esque look at less high-profile whodunits drawn from real life, such as the murder of a Williamsport, Penn., woman by her surgeon husband.

This week's episode (Saturday at 10 pm/ET on CBS) features the grisly tale of an unassuming fourth-grade teacher who hacked her husband to death, then ran errands with his body in her car.